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<title> OS and Network support for video services</title>
<H1> OS and Network support for video services</H1>

<hr>

To support video services on packet switching networks, we are investigating
the design and implementation of operating system techniques,
transport protocols, and network switches 
to enable various types of performance guarantees.  Motivated by variable bit
rate video which has very large picture-to-picture rate fluctuations, we 
proposed a new model for packet video.  In the model, we have retained the 
basic notion of a flow.  Each flow, however, is a sequence of bursts, each 
of which represents an encoded picture.  

<hr>

We have designed an efficient algorithm, called Burst Scheduling, for switching 
the transmission of video flows and other types of traffic (e.g., data and audio) 
in a packet switch.  Burst Scheduling networks provide end-to-end delay 
guarantees for packets and delay jitter guarantees for bursts to video flows 
that satisfy a flow specification.  They have the desirable property that 
guarantees provided to a particular video flow are independent of the behavior 
of other traffic flows sharing the network, and are thus unaffected by the
presence of aggressive or misbehaving traffic sources.

<hr>

<H1> Recent papers and technical reports </H1>

	<ul>
        <li> <b> An algorithm for lossless smoothing of MPEG video</b>
        <br>
        Simon S. Lam, Simon Chow, and David K. Y. Yau
        <br>
        <cite> Proceedings of ACM SIGCOMM '94, London, August 1994</cite>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/smooth.ps.Z">
                <b>compressed postscript file</b></a>
                </ul>
	<li> <b> Delay guarantee of Virtual Clock server</b>
	<br>
	Geoffrey G. Xie and Simon S. Lam
	<br>
	<cite> Technical report TR-94-24, October 6, 1994</cite> 
	<br>
	presented at 9th IEEE Workshop on Computer Communications, October 1994;
        <br>
        <cite>IEEE/ACM Transactions on Networking, December 1995</cite>
	<br>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/tr94-24.ps.Z">
                <b>compressed postscript file</b></a> revised version, September 24, 1995
                </ul>
	<li> <b> Burst Scheduling Networks</b>
	<br>
	Simon S. Lam and Geoffrey G. Xie
	<br>
	<cite> Technical report TR-94-20, July 29, 1994; second revision, August 31, 1996</cite>
	<br>
	(presented at 9th IEEE Workshop on Computer Communications, October 1994)
	<br>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/tr94-20.ps.Z">
                <b>compressed postscript file</b></a>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/infocom95.ps.Z">
                <b>compressed postscript file of <cite> INFOCOM '95 </cite> version </b></a>
                </ul>
        <li> <b> Burst Scheduling networks: Flow Specification and performance guarantees</b>
        <br>
        Simon S. Lam and Geoffrey G. Xie
        <br>
        <cite> Proceedings NOSSDAV '95 Workshop, Durham, New Hampshire, April 1995 </cite>
        <br>
        (extended abstract of Technical report TR-94-20 with more insights)
	<br>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/nossdav.ps.Z">
                <b>compressed postscript file</b></a>
                </ul>

        <li> <b> Group Priority Scheduling </b>
        <br>
        Simon S. Lam and Geoffrey G. Xie
        <br>
        <cite> Technical Report TR-95-28, July 21, 1995; revised, January 4, 1996</cite>; to appear in <cite>INFOCOM '96</cite> 
        <br>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/tr95-28.ps.Z">
                <b>compressed postscript file</b></a>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/infocom96.ps.Z">
                <b>compressed postscript file of <cite> INFOCOM '96 </cite> version </b></a>
                </ul>

        <li> <b> An Efficient Adaptive Search Algorithm for Scheduling Real-Time Traffic </b>
        <br>
        Geoffrey G. Xie and Simon S. Lam
        <br>
        <cite> Technical Report TR-95-29, July 21, 1995; revised, February 1996,
               with a title change</cite>; to appear in <cite>Proc. ICNP '96 </cite>.
        <br>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/aheap.ps.Z">
                <b>compressed postscript file</b></a>
                </ul>

        <li> <b> Operating System Techniques for Distributed Multimedia </b>
        <br>
        David K. Y. Yau and Simon S. Lam 
        <br>
        <cite> Technical Report TR-95-36, July 17, 1995; revised, January 2, 1996</cite>.  
	<br>
An earlier version 
               in <cite> IS&T/SPIE Proceedings Multimedia Computing and Networking (MMCN '96)</cite>,
               January 1996, under a different title.
        <br>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/tr95-36.ps.Z">
                <b>compressed postscript file</b></a>
                </ul>

        <li> <b> Adaptive Rate-Controlled Scheduling for Multimedia Applications </b>
        <br>
        David K. Y. Yau and Simon S. Lam
        <br>
        <cite> Technical Report TR-96-17, April 23, 1996; revised, September 1996</cite>.
        <br>
               To appear in <cite> ACM Multimedia '96</cite>,
               Boston, November 1996.
        <br>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/tr96-17.ps.Z">
                <b>compressed postscript file</b></a>
                </ul>

        <li> <b> Real-Time Block Transfer Under a Link Sharing Hierarchy </b>
        <br>
        Geoffrey G. Xie and Simon S. Lam
        <br>
        <cite> Technical Report TR-96-19, June 14, 1996 (being revised)</cite>.
               An abbreviated version to appear in <cite>INFOCOM '97</cite>
        <br>
                <ul>
                <li> <a href = "ftp://ftp.cs.utexas.edu/pub/lam/info97.ps.Z">
                <b>compressed postscript file of <cite> INFOCOM '97 </cite> version </b></a>
                </ul>

        </ul>

<hr>